<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>盒阴影</title>
    <style type="text/css">
        div {
            width: 300px;
            height: 200px;
            background-color: #f0f;
            margin: 0 auto;
        }

        div:hover {
            box-shadow: 10px 10px 0 0 #bbbbbb
        }

    </style>
</head>
<body>
<div></div>
</body>
</html>
